Water is our most valuable shared resource and together we can keep it
that way for generations to come.
Private Wells vs. Regulated Water

Privately owned wells, primarily serving single homes, have been a health concern to the United States Environmental Protection Agency (USEPA) for many years. Unlike public water systems, private wells lack consistent construction standards and oversight as well as a general lack of water quality monitoring required at local levels. Thus, they are often more susceptible to possible contamination from microbiological, inorganic or organic contaminants. In addition, the cost to monitor private wells by a single family can be cost prohibitive and is therefore rarely performed.

Public water systems such as Mountain Water Company, however, perform rigorous tests for the presence of metals, pesticides, inorganic and organic chemicals, and microbiological organisms. We follow strict guidelines established by the USEPA and the Montana Department of Environmental Quality, frequently monitoring water quality at wells and in the distribution system to ensure that your tap water remains clean and safe for you to drink.

For more information about private wells, please visit www.epa.gov/privatewells/pdfs/household_wells.pdf.

To learn more about the nature of groundwater and the principles of groundwater protection, visit the USEPA’s Ground Water Primer web page at http://www.epa.gov/seahome/gwprimer.html.


- The Missoula Aquifer
- Watershed
- Rattlesnake Lakes
- Backflow/Cross-Connection
- The Water Quality Report
- Water Quality Questions
- Bottled Water vs. Tap Water
- The Milltown Dam
- Private Wells vs. Regulated Water